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Hamburg 2001 – scientific programme

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TT: Tiefe Temperaturen

TT 16: Postersitzung II: Amorphe und Tunnelsysteme, Mesoskopische Systeme, Schwere Fermionen, Kernmagnetismus

TT 16.34: Poster

Tuesday, March 27, 2001, 14:30–17:00, Rang S\ 3

Magnetism in UPd2−xSn — •I. Maksimov1, S. Süllow1, F.J. Litterst1, G.J. Nieuwenhuys2, A.A. Menovsky2, and J.A. Mydosh21Institut für Metallphysik und Nukleare Festkörperphysik, TU Braunschweig, Germany — 2Kamerlingh Onnes Lab., Leiden University, The Netherlands

Small deviations from nominal composition in the palladium content of the heavy-fermion compound UPd2Sn (orthorhombic lattice Pnma) drastically change the physical properties of this material. In particular, instead of an overall metallic resistivity with a positive temperature derivative dρ/dT, UPd1.85Sn (cubic structure Fm3m) exhibits a negative dρ/dT up to room temperature. Further, while UPdxSn with x=2 shows a non-magnetic ground state, specific heat and susceptibility of the compound with x=1.85 indicate antiferromagnetic ordering below TN = 28K. To investigate to what extent chemical pressure or the effect of disorder from Pd deficiency causes the non-metallic resitivity, we have studied compounds UPdxSn with x=1.95 (Pnma) and 1.9 (Fm3m). The first shows properties very similar to UPd2Sn, while the latter resembles the behavior of UPd1.85Sn, indicating that the physics of these compounds is mainly governed by bandstructure effects accompanying the structural transition.
Supported by DFG under grant no. SU 229/1-1.

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